Ergonomic keyboard



FIG. 1 is a top view of an ergonomic keyboard;

FIG. 2 is a bottom view thereof;

FIG. 3 is front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right end view thereof;

FIG. 6 is left end view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for an ergonomic keyboard, as shown. 